viviQuest’s SIM Card Adapter Kit for Nano SIM & Micro SIM Cards SIM cards come in three sizes. Older phones and SIM card readers only fit Standard SIM cards. Micro SIM cards are smaller but not as small as Nano SIM cards. In order for older phones and SIM readers to fit your Micro or Nano size SIM cards, you must have an adapter. viviQuest’s SIM Card Adapter Kit has everything you need to convert Nano SIM to either a Micro or Standard size or Micro SIM to Standard size. It even includes a steel ejection pin so you can easily remove your SIM from your phone.